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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45d76f2c1addd64aa2c0cf7dc8e0bf28c28ab26271f73563963aa53b13083d72' 
  AND token = 'W8YEvVJMbDU12WtMnBJHfhieadgnVc9bhdia9fIXH+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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