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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2513620d56e669fc597ed29b4055b46f623d122a8994c711278a5c0bbb06d8d' 
  AND token = 'dCuFXPy2ZVn7E11HYVxJUnHfTpjX1gt7kaZf+bzs/64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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