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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a308abcd3bc053a0af08d24e9ce799cf4f67e57a369cdcc47a21850e9d75659e' 
  AND token = '8cpXS6U5ASXW7aKmMtNiFun3B8qbx+Rhab+z87Uip24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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