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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcd4a3d7c138e693de8b57f7a75cdabdc90c8685a54ed223e8ee5296e04e160e' 
  AND token = 'zJvjeO9+rbrWaxTwia1UEINl+VE399rEVh++RIrlGl4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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