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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ac95f26bacea544c3babee2e8f66b507fea91f8dd4129b659acf3df7c6c76bc' 
  AND token = 'K45W85JveNfA2jZyyJANmuTb2YvOG72aQ5D9Gr7P1JE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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