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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cffa26bddb223e5aa2aae922720b35ee5675e903b4386fcb8d2bea6457643aaa' 
  AND token = 'qL1h+k/HGmNiMtg3O5fHbr6CCrF5hzjzmFJS8juTFYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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