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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99c52c6c114d0e5d8a2d6032bd814ef6edd002eae9011db6f6ba6b9c5f74fc5d' 
  AND token = 'fAMFiivuq5vWszausQBnaLPicebQdJO8ynZ/xJFQ140=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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