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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6964eedd028ee6a76a29cf215ccafc1607e36f697442ae850f7813d5b12cb0da' 
  AND token = '0wp9x/iepHv621baqWKZ9W3v0g8/qF2KMPi1Q/54N4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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