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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '215fcda99a62ab7559f0fa552153bb5332e608a3caaaac5e66332a8a28eca5c0' 
  AND token = 'WAUgl2kB1lIpMhyAo7Xilixyt2+Vco6kwZRvnyuRATQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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