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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f8b67aa249139ab0fdfc6bec07d52c9847e91d0953dd8af30cab6438f45d8c2' 
  AND token = 'bDbeAfs5iRyx2halILoWDL5qWIyeoCbgC/g/37HSKLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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