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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06738b11a113599948dbe58b24bf28e4d5b817d41705cf98345958f69d8946eb' 
  AND token = 'WYswpo+fL3eYX2Hn2RMUgWK6UN+ijReUWRmbYIe++eE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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