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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbaf0fb77a66f9afdabe9962d1d5a0636512d067428b2144c5ca81517a77a211' 
  AND token = 'RvGsU7IDyWGFpjugh+EbfM6Na3rvhCRJW7NMuHMhY+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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