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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93906c064c333862e6afec63e0deefffe792083e1ee9f06146f5ffd731347d99' 
  AND token = '/KHJqpSXWJ0HWOlz+ejeIrAU9hnTBGpImu+ebsZBawM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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