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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06a1bb40ee18070e368e590eb9a7fe15593475e025055c55c7aaf7dd43ed1dc4' 
  AND token = 'Jwj+SmWCZWw6DxaYpcjK3TyYkOepMF/OVxJ0WaFhZ/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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