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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62d60b3396c31345bde900bef4b806902e6210743f2bcf62f07c71c556cb2b76' 
  AND token = 'VqdOtZND/P6k47G9bpaZEKwxhvbUVS56rT3zOGGcgmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}