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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1b819a76cee4dc98e6582b0da187d7ef8ef81463001cb0eeef457948baf58a3' 
  AND token = 'rrPJM9Rfoh7JDn3mlRA+i3/AbL8x0tXEf1zxxfkInMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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