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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '523db7fc88aab161b064fe5985fce33a05b831d2e9925d4d1659d6c01c0c4b79' 
  AND token = '6OZr9Rpt7El8yWgRK69hYxzdjNynpMJTCwFg5t8DH7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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