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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef833b06e8a652aa3f930dc89f71835e8fc44d915b9a747ea9c53a7865dc5952' 
  AND token = 'T/FocqawsL+nG3m+S046w+ucE9/AuLVdPPsMMNvxrSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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