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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de59c9fdcf0e78e2e83202dade8ac1cb08bc39397e619c9078846a611ad331df' 
  AND token = 'bImTeWMVOWzfAQd/JTXEwYUAU4pNs7kPtFX/eViNNT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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