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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8235c9da8b1fbe1e49ba9fba116a7ea83108b8fae2164e0010870d6bff9615a3' 
  AND token = 'YKZSF7ymfjNxRpKLbfBeUph0Mum+CjsYsDdxPvUNTi0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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