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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6311c7a39398ebdae0f038954e2c5f7077550b72f5f69ffdd4381b8029a11441' 
  AND token = '8y14syBZy29QeJ8ZvCIeMW6XOniv+n66HpAmR2JfAr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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