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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cd2cc8fc17f74bea1599ea8197e41639935670782693cc78343c766e6361b86' 
  AND token = 'dJ28XvJtPsiTsDrl5z3SYk0uvbTRtNIuuuT1sWvA/8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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