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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbdd96742bdd096348b0ef5be7d915b204e444661a4b7ed5e522e6fd2e6f4ad6' 
  AND token = 'E9BdeWsmJNVSxXjCOnO4lKjUvHOuKg/vBQjcAMKvdoU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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