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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2855c9646d4eb22b446e3bb930e5977199096578d50126152c446875d4f2311a' 
  AND token = 'OfFajPw6PZdIe7a29CYGvixjd/cZic5qCUhEizMfid0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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