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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e11c5da406c8bacd4aeffcf9e86cf409cae5de2864b61a9b5ef5f9fede817f0' 
  AND token = 'FkoyPnMj5Nc+apNggaRZjzD0JzGscI7Iss9ocxGPIsg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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