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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da51d712cea36ec1c5afadda0b4bac6917761bb21c06d881f5d15ee33709b36e' 
  AND token = 'kqswhI9edHWH8vvchMo4hkz08ZJ9D6+sZ1Uc/SNobiA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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