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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c456995dbfffc622c279434f1f4bdcfef5858a25323080eb351f1bc3866a823' 
  AND token = '9xY0dx5EBIhboWWubVcMluIkFZ6t1LRrm4eeNWjHgkE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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