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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3a9cc9c9c8ec4ae158612a289b16b9b0eeb6b9d18d58ca43c4e613dc6764611' 
  AND token = 'ptyba5sXK1IXSG8UAZWMFEj2QXIJHOBX5GLKaEPApOw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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