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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c975e82103bf3997333d08083b2791d1ae4e770bc614b716cca6551636912b8b' 
  AND token = 'U7BCqZhOOg7kEPwzK29A9/Jb52+yf67a0FycMuLYN+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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