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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a44b962fb04698468117ff3b9d1e9fafdf9488806fe9ec81ad0e98cd1390c4d7' 
  AND token = 'UzD3zQ0M+aiiYhtG2wpOr3UEcGWJ37piGUUYIz2UPOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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