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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae59fd7e122e64d834a4e8fe0f4f9b3cd298650c569f47a2b40549b179f6a320' 
  AND token = 'kb1GYXTcG5w8x9by4oI81Ul8bSXDejX0K+FsULBaP84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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