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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f95510cd41bd645624b75af626ebc299c8af61e14a6aeabebb60197bbb86effe' 
  AND token = 'lP/ZxaQ0uotB24Y5DKYLDA5R17CufNnETM5KhwMkdeo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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