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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2093b8fd72727d605d72b68b504e3ddf3001234addf7243b94774e465233e8e' 
  AND token = 'c634KGhtY/rP2DhMMuruUqXho1mwxQNWqc/uOD9sXGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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