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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e0cb95c5c81849ff73ae2262c7d9a61c30b2e42f19fca2afef30675e92e615b' 
  AND token = 'QwRrg1qrkGp105fBko8FSMS3kHJ9uJwZAqOYjRRZKR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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