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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd04979c2eca254b6765f392224df491cbeebe2940ddabb3148c987b092e5cc0d' 
  AND token = '55aYfMJw4Iol5bABhOOgMgi9h3RZQVu0J2RSOSIrH2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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