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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f62ab9298db67c9fcdf904e613fc5f95e02527b0ef16ecedf49279ae67b3dd06' 
  AND token = 'EF7yADUtPi05bAafPVp8mcl2EBCc+/TNmyNfCr+0j9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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