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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06570bf5ddbeccf2f3d6e1a92fd04a99b49560e3a9bd10e362d7142d53e26ed0' 
  AND token = 'ARSSUpa9A65Sv0WYCYKFlnoCC1CGHwgI4vsdwJKSnAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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