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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '876ffb4a1bd45f67c814f237a36a1eff40a3878320fb42915999bfc623b80534' 
  AND token = 'eY328HSSduqLuIUrXpUL0Mw8HRyVn+LLK6bsfoFcVNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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