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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b7eb0a75b188a5b70ce0323ebceee69ace9808380de5d1477a1749ded7ef8cb' 
  AND token = 'BX9V3lIYVpxp/v/M2Y6Q8bfP0LCCSXiCxvI7LQVOY2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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