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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78f1b0e9ac96ae5a3cf8ddc097f3e387fc20e04fde03d18c5c1d7cdd44aa7bd7' 
  AND token = 'FJj0ztjug9YdXIxhHNH3zcyPLPkksOGTK8w6GpPoV2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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