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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23df30fef721875d772a079ff8eca15dc1417e7f94508a63686cb0cb76a0c3c4' 
  AND token = 'gprfZoENCIJFMwfgrSOANF9NmvM8lh0koIdKQlrcFiE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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