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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbf9dc0128d8336d7aedf64aa8fa5fef3df36be39a5c47b0909d61042c34f197' 
  AND token = '3q8oCxo3KjkJ78OS7PaUSJY+3wq67l3yIJsa9KNGqf8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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