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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c67e8218773d3c322d8493f7a12951818ebb5ee87a955fa9ddd39dd15d76f904' 
  AND token = 'uAAdiuCW2fWYlbAC2XMDe+ehFZmLc2F101FJ6Hd+dts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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