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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9680c77da4ea4ce8f1f1f8566215e4422d83d51415460f199660eff672290a90' 
  AND token = 'xjEkRpytlISU5h4h84f110VJI4v+gKEUee1LP1lNu0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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