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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d0761ca34486194d04e849545ba4117fd82ae33b957d2b8d521f87797fda6af' 
  AND token = '3rIs+ROHTYbn3f0dGVfk6brkskIxh8lOWnTC7M343HI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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