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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87490557eaaeab11906d6cb7d46dfe0e1e2ef42e0bc89e5f2687ed11205c77b2' 
  AND token = 'jCgC8OFQ7s9qIYEdKWn3ov1hNxa9d13EbziWfXJR1/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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