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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efcd0ad1d4fa908646b1e59001709ae3b096c60d09b58373809ead7c5a6a8148' 
  AND token = 'FqHAZfhMhz9c3MwQ0KRhzdxx3a45o8+R7O0ng3tYujE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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