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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '555572443a22875f4054815d60e4c6fb7b9a498617762a1195e524e3ebf25d92' 
  AND token = 'Mu/K1+ekrPRWtyf3jsqz3cH2ZUMd0vNHEE4BMCcDz6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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