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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d81aee0d8b570bb22ccb63924cda0ff3dba8c794f9e450faa076ad6c3666715' 
  AND token = 'lQrD5pSmbnTYUA1Z/p0OyeiKhRoJeAnXBk5ufWnn6ow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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