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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67b5a97a0016fe8ccb5234ad8daca9b91ca3e9f78322efc2fbb2ea188b77e799' 
  AND token = 'dI3lESRu15bcId+9Lq7QFcEJC7CdAZdJz6lGq3ln7BA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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