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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6c82cd97ece323ac0088cdd9c8359fa5fc4c04652cc3b0706f97118b9aedb22' 
  AND token = 'q59sINVby++qj6Kfbgu5mlepZpojRab7jBCTEnhf5qA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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