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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f11857120e5ca6b9dc5349abb77948f2991805e450a3c93ebea4b1a218b758a' 
  AND token = 'YfybLkWxewHNHaertwLX3bti6Jf45DX+DgedHtO9U88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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