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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd963ad123abdefb12253f21348beca4c1dbe5c3ad3ffe1c7810fcf04b2fa684' 
  AND token = 'WcDmRNP4Wdf4KWw/Pnya8gjg4Q16SdZstsyuJE4cPe0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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