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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '565a847b0456c87c9571c15c27e667c0466018f8c07759a8bb0efb84a989c266' 
  AND token = 'bTFC9dpb9Ay0hjdhU074cYPfW/aM7ZeVwQ+yUWeM4b0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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