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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4215eaefcfb3ce9d3ddf7cbcbf20ca2bc9b3293cd74519815b42f3cf397d6771' 
  AND token = 'qpPqOXEx6GUz3da5iyR7v4tg6HLeWXXEBIyS/GFNRZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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