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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bd3e728b00f74cf7e43e09f31a8e36ba899c363de0e6612db5fbdd2bbf0b392' 
  AND token = 'm0TeFN9Ees/V+r62R2bLbFsfL9S7kitD13ex3ValCqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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