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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98dea2a2ba6beaddb94d2aa446a2805c7e3e10e678e5c7d0715f458662b800a8' 
  AND token = 'BOwuiZd8g0hwxuWMJ/835dx0xciTP+rK02uOSIBW4Ho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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