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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17b24056a20aa32a14835e50ebceb7fec8528b095dd086564625e129f41db5ff' 
  AND token = 'Brb0Ip17yIukF/xpWFdtjqGdK3mCx3Kr2qQFHTnFHsA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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